Riederer, 67, had been battling cancer and retired from practice earlier this year.

Many friends and former associates celebrated his career at a party in November.

Riederer was elected to the Jackson County Legislature in 1978 at the age of 33.

Two years later, he was elected Jackson County prosecutor and re-elected two more times.

KMBC's Micheal Mahoney reported that Riederer was a key figure in starting the anti-drug COMBAT program for Jackson County. The program concentrated on diverting people, especially the young, in rehabilitating their lives as an alternative to jail time.

The Jackson County program served as a model for other communities across America as they set up similar programs, including a drug court diversion project.

During his time as prosecutor, Riederer had an eye for talent. That talent was featured recently in a Kansas City Star profile of his career.

He hired young, promising assistant attorneys like U.S. Sen. Claire McCaskill, Kansas City Police Board member Pat McInerney and Jackson County Judge Charles Atwell, as well as many others.

Riederer also served on the Missouri Court of Appeals.

He is survived by his wife Sandy and two children.

"Kansas City has lost one of its great citizens with the passing of Judge Al Riederer. It was my privilege to co-chair the stadium renovation campaign with him, where I witnessed his tireless work ethic, commitment to all things Kansas City and contagious spirit," said Kansas City Mayor Sly James. "He was a friend, a true civic champion and he will be missed greatly. My thoughts are with Al’s family as they mourn this loss."

Jackson County Executive Mike Sanders issued the following statement Thursday:

"Today, we lost a truly great human being. Albert dedicated much of his life and career to helping improve the lives of others. His contributions as an elected official, civic leader, and mentor are still felt today. As Jackson County Prosecutor, he set an example for all other prosecutors to follow. Although he is no longer with us, Albert’s spirit will live on, both in the people he touched and in the community that he cared so deeply about."

Sanders said the flags at all county buildings were being flown at half-staff in Riederer's honor.

Jackson County Prosecutor Jean Peters-Baker issued the following statement:

"Personally and professionally this is a loss. Albert Riederer served as a mentor to me and helped shape the Jackson County Prosecutor’s Office. Albert left an indelible imprint on the Jackson County Prosecutor’s Office. Albert’s legacy encouraged the upmost in ethics, honestly, fair dealing and compassion. Albert was a true leader who faithfully served the citizens of Jackson County for decades. An award was established in his name for the assistant prosecutor who exemplifies those same qualities and high standards that Albert exhibited in his practice of law."

"He is irreplaceable, and to this day, the Jackson County Prosecutor’s Office remembers the spirit, honesty and integrity of Albert Riederer and strives to maintain the standards that he left behind. Our thoughts and prayers are with his family."